期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.067201
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资金
- EPSRC [EP/J003557/1]
- Engineering and Physical Sciences Research Council [EP/J003557/1] Funding Source: researchfish
- EPSRC [EP/J003557/1] Funding Source: UKRI
In rhombohedral CaMn7O12, an improper ferroelectric polarization of magnitude 2870 mu Cm-2 is induced by an incommensurate helical magnetic structure that evolves below T-N1 = 90 K. The electric polarization was found to be constrained to the high symmetry threefold rotation axis of the crystal structure, perpendicular to the in-plane rotation of the magnetic moments. The multiferroicity is explained by the ferroaxial coupling mechanism, which in CaMn7O12 gives rise to the largest magnetically induced, electric polarization measured to date.
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